Parking Brake Actuator

This procedure covers the removal and replacement of the electric parking brake actuator on a 2023 Rivian EDV 500, including high-voltage system disablement and brake system verification.

Warnings

Tools required

Parts

• Parking brake actuator assembly × 1 — Use OEM specification
• Parking brake actuator wiring harness (if damaged) × 1 — Use OEM specification
• Actuator mounting hardware kit × 1 — Use OEM specification

Preparation

1. Park vehicle on level, solid ground and apply parking brake
2. Place wheel chocks in front of and behind the front wheels
3. Ensure vehicle is in Park mode
4. Verify Rivian diagnostic scanner is functional and compatible with 2023 EDV 500 model
5. Put on high-voltage safety gloves and have insulated tools ready
6. Open all vehicle doors to prevent lockout during 12V battery disconnect
7. Document any existing parking brake fault codes using diagnostic scanner
8. Photograph parking brake actuator wiring connections before disassembly

Procedure

1. 1

   Disable high-voltage system
   Access the HV disconnect located in the front compartment. Using insulated tools and wearing HV safety gloves, remove the HV disconnect cover by removing the fasteners. Pull the HV service disconnect handle to the OFF position. Lock out the disconnect with a padlock or tag. Wait minimum 5 minutes for capacitors to discharge. Use multimeter to verify 0V across HV bus bars before proceeding.
2. 2

   Disconnect 12V battery
   Locate the 12V battery in the front storage compartment. Disconnect the negative terminal first, then the positive terminal. Isolate terminals to prevent accidental reconnection. Wait 2 minutes for vehicle control modules to power down completely.
3. 3

   Raise and support vehicle
   Lift the rear of the vehicle using a jack at the designated rear lift point. Support the vehicle with jack stands rated for the EDV 500's weight (approximately 6,000 lbs) at the manufacturer-specified jacking points on the chassis. Lower vehicle onto stands and verify stability. Remove rear wheels for better access to parking brake components.
4. 4

   Access parking brake actuator
   The parking brake actuator is mounted on the rear caliper assembly. Remove any protective shields or covers around the rear brake caliper by removing Torx fasteners. Identify the actuator motor assembly mounted to the top or rear of the brake caliper housing. Clean the area around the actuator to prevent contamination during removal.
5. 5

   Connect diagnostic tool and retract actuator
   Reconnect the 12V battery temporarily (negative terminal only, do not fully secure). Connect the Rivian diagnostic scanner to the OBD-II port. Power on the vehicle to accessory mode. Navigate to the parking brake service function in the scanner. Select 'Retract Parking Brake Actuator' to electronically retract the actuator mechanism fully. This relieves tension on the system. Once retraction is confirmed, power down vehicle and disconnect 12V negative terminal again.
6. 6

   Disconnect actuator electrical connector
   Locate the electrical connector on the parking brake actuator. Press the locking tab and carefully disconnect the wiring harness from the actuator. Inspect connector for corrosion, damage, or moisture intrusion. If connector is damaged, replacement wiring harness is required. Secure the wiring harness away from the work area using cable ties or wire.
7. 7

   Remove actuator mounting fasteners
   Identify the actuator mounting bolts connecting the actuator motor to the caliper housing. These are typically two or three bolts accessible from the rear of the caliper. Using appropriate socket or Torx bit, remove the mounting fasteners. Support the actuator with one hand while removing the final fastener to prevent it from falling.
8. 8

   Remove parking brake actuator
   Carefully pull the actuator assembly away from the caliper housing. The actuator may have a drive gear that meshes with the caliper mechanism; rotate slightly while pulling if necessary to disengage. Inspect the mounting surface on the caliper for damage, corrosion, or debris. Clean mounting surface with brake cleaner and a wire brush if needed.
9. 9

   Install new parking brake actuator
   Align the new actuator assembly with the mounting holes on the caliper housing. Ensure the actuator drive gear properly engages with the caliper mechanism. Hand-thread all mounting fasteners first to ensure proper alignment before tightening. Since no torque specifications are provided in the database, tighten fasteners in a cross-pattern to manufacturer specification (refer to service manual or use approximately 15-20 ft-lbs for typical M8 actuator bolts, but verify with OEM documentation).
10. 10

    Reconnect electrical connector
    Route the wiring harness to the new actuator, ensuring it follows the original path without interference with suspension components or wheel. Connect the electrical connector to the actuator, ensuring it clicks fully into place. Verify the locking tab is engaged. Tug gently on the connection to confirm it is secure.
11. 11

    Reinstall wheels and lower vehicle
    Reinstall rear wheels and hand-tighten lug nuts in a star pattern. Raise vehicle slightly off jack stands, remove stands, and lower vehicle to the ground. Torque lug nuts to Rivian specification (typically 150 ft-lbs for EDV 500, but verify in owner's manual) in a star pattern.
12. 12

    Reconnect 12V battery
    Reconnect the 12V battery positive terminal first, then the negative terminal. Ensure connections are clean and tight. Vehicle control systems will initialize; this may take 30-60 seconds.
13. 13

    Calibrate parking brake actuator
    With vehicle still on level ground and wheel chocks in place, connect the diagnostic scanner. Power vehicle to accessory mode. Navigate to parking brake service functions. Select 'Calibrate Parking Brake Actuator' or 'Parking Brake Learn Procedure'. Follow on-screen prompts to complete the calibration cycle. The actuator will extend and retract several times during this process. Calibration typically takes 2-3 minutes. Verify calibration completes without error codes.
14. 14

    Re-enable high-voltage system
    Return to the front compartment. Wearing HV safety gloves, remove lockout/tagout from HV service disconnect. Push the HV disconnect handle to the ON position. Replace HV disconnect cover and secure all fasteners. Verify HV system status on vehicle display shows 'Ready'.

Reassembly

1. Reinstall any protective shields or covers removed during disassembly
2. Ensure all wiring harnesses are properly routed and secured away from moving components
3. Verify all tools and parts have been removed from under the vehicle
4. Double-check all fasteners are properly tightened

Verification

• With vehicle on level ground and wheel chocks in place, power on the vehicle fully
• From inside the vehicle, manually engage the parking brake using the button or switch
• Verify the parking brake indicator illuminates on the instrument cluster
• Attempt to move the vehicle in Drive mode; vehicle should not move with parking brake engaged
• Disengage the parking brake and verify indicator light turns off
• Test drive vehicle at low speed in a safe area and verify parking brake can be engaged and disengaged while stationary
• Scan for diagnostic trouble codes related to parking brake system; verify no faults present
• Perform final parking brake hold test on an incline (if safe area available): engage parking brake on a moderate slope and verify vehicle remains stationary
• Check parking brake actuator area for any unusual noises, binding, or mechanical interference during operation

Related trouble codes on this vehicle

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